Well mouth test blowout preventer of water injection well

Abstract

The invention discloses a well mouth test blowout preventer for a water injection well. The well mouth test blowout preventer mainly comprises a blowout-preventing pipe; a blowout-preventing box is arranged at the upper end of the blowout-preventing pipe; the lower end of the blowout-preventing pipe is connected with a sealing pin; the blowout-preventing pipe and the sealing pin are connected into a whole, then are arranged on a lifting device in a sleeved mode and are arranged on or dismounted from a well mouth through the lifting device. A driving device for lowering and lifting a test instrument is arranged on the blowout-preventing box in a sleeved mode. The blowout preventer can effectively improve the test success rate of a high-pressure water injection well, and meanwhile the test accuracy and the water distribution percent of pass can be improved. The problem of testing of the high-pressure water injection well is solved, and the blowout preventer has the higher application and popularization value in testing of a normal-pressure water injection well. In a word, the well mouth test blowout preventer has the advantages that ground hydraulic lifting is adopted by the blowout preventing pipe, and worker climbing or crane working is removed; gap flow leakage and pressure reduction and secondary self-sealing blowout preventing are adopted, and well mouth miss is reduced; a motor drives a steel wire to overcome underground high-pressure strong descending and automatic continuous conveying.

Description

technical field [0001] The invention relates to wellhead sealing and blowout prevention technology during testing and deployment of water injection wells in oil fields, in particular to a wellhead testing blowout prevention device for water injection wells. Background technique [0002] At present, the existing wellhead blowout prevention technology for water injection well testing is mainly aimed at water injection wells with normal pressure (water injection pressure ≤ 25MPa). During the layered test of water wells, there were problems such as imperfect supporting technology, specifically the following aspects: the packing mechanism was difficult to seal high pressure, the spray leakage was serious during the process of lifting and lowering the instrument, and it was easy to cause environmental pollution; Difficult to disassemble and heavy on-site operations; the high pressure at the wellhead acts on the sealing packing to compress the steel wire, and at the same time gener...

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Problems solved by technology

[0002] At present, the existing wellhead blowout prevention technology for water injection well testing is mainly aimed at water injection wells with normal pressure (water injection pressure ≤ 25MPa). During the layered test of water wells, there were problems such as imperfect supporting technology, specifically the following aspects: the packing mechanism was difficult to seal high pressure, the spray leakage was serious during the process of lifting and lowering the instrument, and it was easy to cause environmental pollution; Difficult to disassemble and heavy on-site operations; the high pressure at the wellhead acts on the sealing packing to compress the steel wire, and at the same time generates an upward force on the steel wire, which makes it difficult to lift and lower the test instrument. When going down, it needs to overcome the upward force and compression force, and the test instrument relies on weight It is difficult to go down, and workers need to climb up and manually transport; when lifting, the upward force is converted into power, so that the speed of the steel wire rushing out cannot be controlled, and the steel wire cannot be retracted synchronously with the winch and scattered on the ground

[0003] The new type of blowout preventer retrieved from the literature is only equipped with a vent valve on the upper wall of the blowout preventer body. When the wellhead pressure is high, the pressure relief control can be performed, but there are still disadvantages of leakage and pollution of the environment.

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